Screw removing tool



Nov. 3, 1953 c. R. SUMNER 2,657,602

SCREW REMOVING TOOL Filed Dec. 29, 1951 INVEN TOR. O/AEAES E50/1/VEE.

KBQQMS 93 ATTORNEY Patented Nov. 3, 1953 UNITED STATES PATENT OFFICE SCREW REMOVING TOOL Charles R. Sumner,0handler, Application December 29, 1951, Serial No. 264,080

3 Claims. (Cl..81-- 52.35)

This invention pertains to improvements in screw removing devices and is particularly directed to improvements in a tool for use in removing stuck screws, bolts and the like.

One of the objects of this invention is to provide an improved tool for use in conjunction with an air gun in breaking loose stuck screws, bolts and the like in structures.

Still another object of this invention is to provide a tool for removing tight screws, bolts and the like by the application of vibratory hammering action while slowly rotating the tool to release the screws, etc.

Still another object of this invention is to provide an improved percussion operated tool adapted to remove damaged and broken screws by the direct application of the tool and the slow rotation thereof while energizing the tool from an air hammer gun or the like.

Further features and advantages of this invention will appear from a detailed description of the drawings in which:

Fig. l is a view showing the tool and an actuating air gun or the like.

Fig. 2 is an assembled view showing the use of the tool mounted on the air hammer or gun and applied to removing a screw from a structure.

Fig. 3 is an enlarged sectional view through the tool shown in Figs. 1 and 2.

Fig. 4 is a section on the line 4-4 of Fig. 3.

As illustrative of one preferred form of this invention there is shown a screw removing tool comprising a main cylindrical body portion I on the outer end of which is fixed the operating handle II which may take the form of the T- handle shown in Figs. 1 and 2 or may also be in the nature of a single lever ratchet type handle of well known construction.

The body portion II] which is preferably of cylindrical form terminates in a closed bottom I3 in which is formed an Opening I4 having flattened abutment sides I5 in which nicely slides the operating plunger [6 having a diameter portion I I slidingly engaging the bore l4 and fiattened abutment faces l8 slidingly engaging the flattened abutment sides I 5 of the bore I4 so that the body portion may positively rotate the plunger I6 during operation of the device. A stop shoulder I9 is formed on the plunger I6 and engages the surface 2|] of the portion I3 of the body I0 of the tool to prevent the plunger I6 from passing thru the opening in the member I3.

On the other side of the member l3 from the surface 20 there is provided a resilient washer or collar 2| which engages the surface 22 of the portion I3 and in turn is backed up by a washer 23 secured against axial movement on the plunger I6 by a suitable cotter pin 24. On the end of the plunger I6 may be mounted the usual air drill screw driver member 25 terminating in the screw driver end 26 which may be in the form of the four fluted Phillips type screw driver or any other suitable form as used in general commercial practice.

The upper portion of the plunger I6 is provided with a stop shoulder 21 for limiting the inward positioning of the hub portion 28 of an air gun 29 by abutment of its surface 30 against the surface 21 of the plunger I6. A reduced end portion 3| nicely fits in a bore 32 in the air gun 29 so that its outer end 33 may be actuated by the operating plunger 34 of the air gun 29 in the well known manner.

The operation of the tool is substantially as follows: The operator places the air gun 29 into the bore 35 of the body portion l 0 of the tool and then places the screw driver end 26 into the screw that is stuck and difiicult to remove. The two units are then held against the screw and the air gun operated while the operator slowly rotates the T-handle II or equivalent ratchet handle to slowly rotate the body portion l 0 while a pulsating tapping is being applied to the outer end 33 of the plunger I6. This vibratory action accomplishes two important functions. First, the vibratory pressure on the head of the screw 36 to be removed tends to break loose and push the screw slightly further inwardly to release the tension in the screw against its threads 31 in engagement with the work in which the screw is mounted. Further, the vibratory pressure on the plunger [6 also causes the screw driver end 26 to further embed itself more firmly and more positively in driving relationship in the head of the screw, especially under conditions where the original head and grooving thereof has been destroyed or badly damaged by ordinary rotary removing tools. Thus as the air gun pressure is continuously applied and the tool slowly rotated the screw is easily, quickly and efliciently removed without damage to the work.

While the apparatus herein disclosed and described constitutes a preferred form of the invention, it is also to be understood that the apparatus is capable of mechanical alteration without departing from the spirit of the invention and that such mechanical arrangement and commercial adaptation as fall within the scope of the appendent claims are intended to be included herein.

Having thus fully set forth and described this invention what is claimed as new and desired to be obtained by United States Letters Patent is:

1. A screw removing tool comprising, a body portion, a solid Operating plunger mounted for axial movement in said body portion, resilient means secured between said plunger and body portion for limiting said axial movement of said plunger relative to said body portion, means for rigidly attaching a screw driver bit to the outer end of said plunger, socket means in said body portion for supporting a power operated hammer so as to apply axial hammer blows to the inner end of said plunger, inter-engaging abutment surfaces on said body portion and said plunger, and handle means fixed on said body portion to effect manual rotation of said tool and screw driver bit While applying power to said hammer on the inner end of said plunger.

2. A screw removing tool comprising a cylindrical body member, a closed end at one end of said body member, a hole in said closed end, flattened abutment surfaces in said hole, an operating plunger having a sliding fit in said hole in said closed end, flattened abutment sides on said plunger slidingly engaging the flattened abutment surfaces in said hole, resilient means between said body member and said plunger for limiting the relative axial movement of said plunger in said hole in said closed end, a screw driver bit fixed to the outer end of said plunger, a wrench handle means fixed on said cylindrical body portion for rotating said cylindrical body member, and a bore in said substantially cylindrical member for receiving and supporting a power operated hammer device for applying hammer blows to the inner end of said plunger when said screw driver bit is inserted in a screw to be removed.

3. A screw removing tool comprising, a cylindrical body member, a bore in said member, a closure member at one end of said cylindrical member, means for mounting a plunger in said closure portion for resilient limited axial movement in said closure member, means including abutment surfaces on said body member engaging mating abutment surfaces on said plunger for rotating said plunger upon rotation of said cylindrical portion, wrench handle means fixed on said cylindrical portion, a screw driver bit fixed on the outer end of said plunger, and means for supporting a power hammer device in the open end bore of said cylindrical body member to apply hammer blows to the inner end of said plunger when said screw driver bit is inserted in a screw to be removed.

CHARLES R. SUMNER.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,459,402 Johnson June 19, 1923 1,743,505 Turgeon Jan. 14, 1930 1,832,123 Holland Nov. 17, 1931 1,952,395 Tillyer et al Mar. 27, 1934 2,518,049 Mosier Aug. 8, 1950 2,591,323 Webb Apr. 1, 1952 

